Personal protective equipment for cooling tower workers?

I have a contractor working in a cooling tower known to be infected with Legionella. What special personal protective equipment do they need to work in that area? They are wearing tyvex suits, rubber boots, rubber gloves, and a half mask respirator. Is there any chance they might need a full face respirator due to the mucous membranes in the eyes?

A P95 half face mask respirator is sufficient to prevent inhalation of  Legionella that may be in an aerosol from the tower water. Legionnaires’ disease is not transmitted via mucous membrane exposure. The rest of the equipment that you mention will protect them from the chemicals commonly used to treat cooling towers.